<!DOCTYPE html>
<html lang="en">

   <head>
      <meta charset="UTF-8">
      <meta http-equiv="X-UA-Compatible" content="IE=edge">
      <meta name="viewport" content="width=device-width, initial-scale=1.0">
      <title>评论回车发布</title>
      <style>
          .wrapper {
              min-width: 400px;
              max-width: 800px;
              display: flex;
              justify-content: flex-end;
          }

          .avatar {
              width: 48px;
              height: 48px;
              border-radius: 50%;
              overflow: hidden;
              background: url(./images/avatar.jpg) no-repeat center / cover;
              margin-right: 20px;
          }

          .wrapper textarea {
              outline: none;
              border-color: transparent;
              resize: none;
              background: #f5f5f5;
              border-radius: 4px;
              flex: 1;
              padding: 10px;
              transition: all 0.5s;
              height: 30px;
          }

          .wrapper textarea:focus {
              border-color: #e4e4e4;
              background: #fff;
              height: 50px;
          }

          .wrapper button {
              background: #00aeec;
              color: #fff;
              border: none;
              border-radius: 4px;
              margin-left: 10px;
              width: 70px;
              cursor: pointer;
          }

          .wrapper .total {
              margin-right: 80px;
              color: #999;
              margin-top: 5px;
              opacity: 0;
              transition: all 0.5s;
          }

          .list {
              min-width: 400px;
              max-width: 800px;
              display: flex;
          }

          .list .item {
              width: 100%;
              display: flex;
          }

          .list .item .info {
              flex: 1;
              border-bottom: 1px dashed #e4e4e4;
              padding-bottom: 10px;
          }

          .list .item p {
              margin: 0;
          }

          .list .item .name {
              color: #FB7299;
              font-size: 14px;
              font-weight: bold;
          }

          .list .item .text {
              color: #333;
              padding: 10px 0;
          }

          .list .item .time {
              color: #999;
              font-size: 12px;
          }
      </style>
   </head>

   <body>
      <div class="wrapper">
         <i class="avatar"></i>
         <textarea id="tx" placeholder="发一条友善的评论" rows="2" maxlength="200"></textarea>
         <button>发布</button>
      </div>
      <div class="wrapper">
         <span class="total">0/200字</span>
      </div>
      <div class="list">
         <div class="item" style="display: none;">
            <i class="avatar"></i>
            <div class="info">
               <p class="name">清风徐来</p>
               <p class="text">大家都辛苦啦，感谢各位大大的努力，能圆满完成真是太好了[笑哭][支持]</p>
               <p class="time">2022-10-10 20:29:21</p>
            </div>
         </div>
      </div>
      <script>
         const tx = document.querySelector('#tx')
         const total = document.querySelector('.total')
         // 获取焦点时，显示字数统计
         tx.addEventListener('focus', function (){
            total.style.opacity = 1
         })
         // 失去焦点时，隐藏字数统计
         tx.addEventListener('blur', function (){
            total.style.opacity = 0
         })
         // 输入时，实时更新字数统计
         tx.addEventListener('input', function (){
            total.innerHTML = tx.value.length + '/200'
         })
      </script>
   </body>

</html>